The drill size chart contains tools up to 1.5 inches in diameter, but larger tools are also commonly used.Most other countries, especially in Europe, have abandoned them entirely in favor of metric systems. They are also seen in the UK to a lesser degree, having been largely replaced by metric sizes. Although they originated in the 19 thcentury, these gauges are still commonly used in the U.S. They are loosely based on the Stubs Steel Wire Gauge, with gauge sizes that are similar (but not entirely identical) to that system. Number and letter gauges for drill bits do not follow a formula or standard increments. The wire gauge and letter systems refer to tool diameters that increase as the wire gauge decreases from #107 to #1 and then continues from A to Z.Fractional sizes are measured in inches, while metric sizes are measured in millimeters.The second and third columns show the decimal equivalents of the diameters are shown in both English and Metric units.This table is split up into 4 sections as it would make a very long list on the page otherwise. The first shaded column shows fractional, metric, wire gauge number, and letter columns.The drill size chart below provides a list of standard size drill bits in several measurement systems.The drill bits that I use every day range in size from 0.8 mm (0.0025 ct) to 5.0 mm (0.50 ct) in diameter and I tend to buy them in the sizes closest to the gems I set. for me, as a general rule, I tend to buy my drill bits in sizes that allow me to set round gems. I personally rarely ever use one over 5mm in size. Drill Bit Size Chart Legend: Fractional Inch (1/X') Letter Drill Sizes (A-Z) Millimeter Std Sizes (0.5-25). Tap Drill / Common Uses: Drill Sizes up to 1' Diameter. I will not go into that as most jewelers use very small drill bits. Letter Drill Sizes (A-Z) Millimeter Std Sizes (0.5-25) Number Drill Sizes (1-80). But I decided that I should include additional information as it makes the discussion complete.Ī common standard for metric drill sizes is the Renard series, which uses a simple factor to determine the diameter. As a jeweler you really should be using metric drill bits.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |